<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>用于字符串的 + 运算符</title>
	<script>
		txt1 = "What a very";
		txt2 = "nice day";
		txt3 = txt1 + txt2 + "!!!!!!";
		console.log(txt3);

		
		
		
	</script>
</head>
<body>

</body>
</html>